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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
Excited states result from the absorption of energy by the outermost, or valence, electrons of an atom that cause a jump to higher energy shells or orbitals. The excited state electron does not remain excited permanently but emits energy in the form of light in order to return to its original ground state. Excited states are important parts of some reactions as well as in the analysis of substances. To unlock this lesson you must be a Study.com Member.